<template>
    <div>
        <!--顶部滑动条区域-->
        <div id="slider" class="mui-slider">
            <div id="sliderSegmentedControl"
                 class="mui-scroll-wrapper mui-slider-indicator mui-segmented-control mui-segmented-control-inverted">
                <div class="mui-scroll">
                    <a :class="['mui-control-item',item.id==0?'mui-active':'']" v-for="item in cates" :key="item.id" @tap="getPhotoListByCateId(item.id)">
                        {{item.title}}
                    </a><!--tap是为了解决在手机手机上click失效的问题-->
                </div>
            </div>
        </div>

        <!--图片列表区域-->
        <ul class="photo-list">
            <router-link v-for="item in list" :key="item.id" :to="'/home/photoinfo/'+item.id" tag="li">
                <img v-lazy="item.img_url">
                <div class="info">
                    <h1 class="info-title">{{item.title}}</h1>
                    <div class="info-body">{{item.zhaiyao}}</div>
                </div>
            </router-link>
        </ul>
    </div>
</template>

<script>
    //1.导入mui的js文件
    import mui from '../../lib/mui/js/mui.min.js'
    import  {Toast} from 'mint-ui'
    export default {
        data() {
            return {
                cates:[],//所有分类的列表数组
                list:[]//
            }
        },
        created(){
          this.getAllCategory();
          this.getPhotoListByCateId(0);
        },
        mounted() {//当 组件中的DOM结构被渲染好并放到页面中后，会执行这个钩子函数
            //如果要操作元素了，最好在mounted里面，因为，这时候的DOM元素是最新的
            //2.初始化滑动控件
            mui('.mui-scroll-wrapper').scroll({
                deceleration: 0.0005 //flick 减速系数，系数越大，滚动速度越慢，滚动距离越小，默认值为0.0006
            })
        },
        methods: {
            getAllCategory() {//获取所有的图片分类
                this.$http.get('getImgCategory.json').then(result=>{
                        if (result.body.status === 0) {
                            //手动拼接出一个最完整的分类列表
                            this.cates = result.body.message;
                        }else{
                            Toast("列表获取失败！")
                        }
                    }
                )
            },
            getPhotoListByCateId(cateId){//根据分类id获取图片列表
                this.$http.get('getImg/'+cateId+'.json').then(result=>{
                    if(result.body.status===0){
                        this.list=result.body.message;
                    }else{
                        Toast("获取图片列表失败");
                    }
                })

            }
        }
    }
</script>

<style lang="scss" scoped>
    * {
        touch-action: pan-y; /*为了解决滑动时的控制台报警告*/
    }
    .photo-list{
        list-style: none;
        margin: 0;
        padding:10px 10px 0 10px;
        li{
            background: #ccc;
            text-align: center;
            margin-bottom: 10px;
            box-shadow: 0 0 9px #999;
            position: relative;
            img{
                width: 100%;
                vertical-align: middle;
            }
            img[lazy="loading"]{
                width: 40px;
                height: 300px;
                margin: auto;
            }
            .info{
                color: white;
                text-align: left;
                position: absolute;
                bottom: 0;
                background: rgba(0,0,0,0.4);
                max-height: 84px;
                width: 100%;
                .info-title{
                    font-size: 14px;
                }
                .info-body{
                    font-size: 12px;
                }
            }
        }


    }

</style>
